Require <map name> to be unique (map-dup-name)

In HTML5 <map name> to be a unique name.

Rule details

Examples of incorrect code for this rule:

<map name="foo"></map>
<map name="foo"></map>
error: <map> name must be unique (map-dup-name) at inline:2:6:
  1 | <map name="foo"></map>
> 2 | <map name="foo"></map>
    |      ^^^^


1 error found.

Examples of correct code for this rule:

<map name="foo"></map>
<map name="bar"></map>

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